Mia Wasikowska as Miss Novak

Sidse Babett Knudsen as Miss Dorset

Amir El-Masry as Mr. Dahl

Elsa Zylberstein as Elsa's Mother

Mathieu Demy as Elsa's Father

Ksenia Devriendt as Elsa

Luke Barker as Fred

Florence Baker as Ragna

Samuel D Anderson as Ben

Gwen Currant as Helen

Amanda Lawrence as Miss Benedict

Sam Hoare as Fred's Father

Camilla Rutherford as Fred's Mother

Keeley Forsyth as Ragna's Mother

Lukas Turtur as Ragna's Father

Isabel Lamers as Doctor

Andrei Hozoc as Corbinian

Laoisha O'Callaghan as Helen's Mother (as Laisha O'Callaghan)

Sade McNichols-Thomas as Joan

Szandra Asztalos as Housekeeper

Rebecca Crankshaw as Sports Teacher